Observations of H alpha intensity oscillations in a flare ribbon
(2005) The Astrophysical Journal : an international review of astronomy and astronomical physics — Vol. 620, n° 2, p. 1101-1106 (2005)
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- Abstract
- High-cadence Halpha blue wing observations of a C9.6 solar flare obtained at Big Bear Solar Observatory using the Rapid Dual Imager are presented. Wavelet and time-distance methods were used to study oscillatory power along the ribbon, finding periods of 40 - 80 s during the impulsive phase of the flare. A parametric study found statistically significant intensity oscillations with amplitudes of 3% of the peak flare amplitude, periods of 69 s (14.5 mHz) and oscillation decay times of 500 s. These measured properties are consistent with the existence of flare-induced acoustic waves within the overlying loops.
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McAteer, R., Gallagher, P., Brown, D., Bloomfield, D., Moore, R., Williams, D., Mathioudakis, M., Katsiyannis, A., & Keenan, F. (2005). Observations of H alpha intensity oscillations in a flare ribbon. The Astrophysical Journal : an international review of astronomy and astronomical physics, 620(2), 1101-1106. https://doi.org/10.1086/427084 (Original work published 2005)